Question:
Which of the following is a Pulse Digital Modulation mechanism?
Which of the following is a Pulse Digital Modulation mechanism?
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Remember: PAM, PWM, and PPM are "Pulse Analog" because they vary a pulse property continuously. PCM is "Digital" because it uses binary numbers to describe the signal.
Updated On: Jul 1, 2026
- Pulse Amplitude Modulation
- Pulse Width Modulation
- Pulse Position Modulation
- Pulse Code Modulation
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The Correct Option is D
Solution and Explanation
Pulse modulation techniques are categorized based on whether the pulses themselves are analog or represent discrete digital values.
1. Analog Pulse Modulation:
In these methods, one parameter of a pulse train is varied in a continuous manner according to the analog message signal.
• PAM: Amplitude is varied.
• PWM: Width (duration) is varied.
• PPM: Position in time is varied.
While the carrier is made of pulses, the information is still carried in an analog (continuous) format.
2. Digital Pulse Modulation:
Pulse Code Modulation (PCM) is fundamentally different. It involves three distinct steps:
• Sampling: Converting the continuous signal into discrete-time samples.
• Quantization: Mapping the continuous amplitude values of those samples into a finite set of discrete levels.
• Encoding: Representing each quantized level as a unique binary code (a sequence of '0's and '1's).
3. Conclusion: Because PCM converts the information into a true digital format where only discrete binary pulses are transmitted, it is the only "Pulse Digital Modulation" mechanism among the choices provided.
• PAM: Amplitude is varied.
• PWM: Width (duration) is varied.
• PPM: Position in time is varied.
While the carrier is made of pulses, the information is still carried in an analog (continuous) format.
2. Digital Pulse Modulation:
Pulse Code Modulation (PCM) is fundamentally different. It involves three distinct steps:
• Sampling: Converting the continuous signal into discrete-time samples.
• Quantization: Mapping the continuous amplitude values of those samples into a finite set of discrete levels.
• Encoding: Representing each quantized level as a unique binary code (a sequence of '0's and '1's).
3. Conclusion: Because PCM converts the information into a true digital format where only discrete binary pulses are transmitted, it is the only "Pulse Digital Modulation" mechanism among the choices provided.
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